# Gas Certificate App UK: CP12 — Engineer Software & Job Sheets

> Digital gas safety certificates, invoices, and job management for UK gas engineers. (iPhone/iPad app by Trade Apps LTD.)

- Source: https://appshunter.io/ios/app/gas-certificate-app-uk-cp12/id1293890970 (this page in markdown: same URL + `.md`)
- Developer: [Trade Apps LTD](https://appshunter.io/developer/1293890969)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 62 MB
- Languages: American English
- Released: 2017-10-09
- Data updated: 2026-10-19
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/gas-certificate-app-uk-cp12/id1293890970/reviews.md

## What is Gas Certificate App UK?

Built for the job, Gas Certificate App helps UK gas engineers replace paperwork with a faster digital workflow. Create, store and send professional gas certificates, manage customers and jobs, schedule work, and prepare invoices and quotes.

Supporting gas engineers for more than nine years, the app is built for sole traders, growing teams and larger organisations that need reliable access to their paperwork on site, in the office or on the move.

CREATE AND SEND GAS CERTIFICATES
Complete industry-standard records from your iPhone or iPad, add electronic signatures and send finished documents to customers without returning to the office.

The certificate library includes:
• Landlord and Homeowner Gas Safety Records, including CP12
• Gas Service and Breakdown Records
• Gas Warning Notices
• Gas Boiler Commissioning Checklists
• Legionella Risk Assessments
• Non-Domestic and Commercial Gas Safety Records
• Catering, Leisure and LPG Gas Safety Records
• Gas Testing and Purging Records
• Domestic and Commercial Oil Certificates
• Powerflush Certificates
• Unvented Hot Water Cylinder Records
• Heat Pump Commissioning and Servicing Records
• Mobile Catering Vehicle and Caravan or Boat Safety Records
• Installation, Commissioning and Decommissioning Records
• Job sheets

WORK OFFLINE AND SYNC LATER
No signal at the property? Continue without an internet connection. Create certificates, access customer information and manage your schedule offline, then sync your records automatically when you reconnect.

MANAGE CUSTOMERS, JOBS AND TEAMS
Keep customer details, property addresses, job history, photos and documents organised. Certificates, invoices, quotes and attachments are automatically associated with the relevant address, helping you find previous work quickly.

Use the calendar and diary to schedule appointments, create job sheets, assign work and keep your team informed. User permissions, reporting tools and dashboards give businesses visibility across their workload.

CREATE INVOICES, QUOTES AND ESTIMATES
Build professional invoices, quotes and estimates from the same app. Monitor payment status, identify outstanding or uninvoiced work, send quote-acceptance emails and support Domestic Reverse Charge VAT where required.

AUTOMATE SERVICE REMINDERS
Stay ahead of annual inspections and encourage repeat business with automated customer reminders. Send service-due and appointment reminders by email or SMS and track important emails.

USE PRACTICAL TOOLS ON SITE
Work efficiently with tools designed for gas and heating engineers:
· Imperial and metric gas rate calculator
· Searchable library of more than 5,000 boiler manuals
· Postcode lookup and Google Maps integration
· TPI, Testo and Sauermann gas analyser integrations
· QuickBooks integration and Xero support
· File and photo uploads
· To-do lists and customer communication tools

CREATE PROFESSIONAL DOCUMENTS

Add your company logo and electronic signature for consistent documentation. Store certificates, invoices, quotes, job sheets, images and customer records securely, with unlimited cloud storage and syncing between devices.

UK-BASED SUPPORT
Access UK-based support by live chat, phone or email. Get help with setup, customer imports, troubleshooting and team management.

GO PAPERLESS WITH GAS CERTIFICATE APP
Spend less time on administration and more time completing work. Create certificates on site, organise jobs, send invoices and stay connected with customers from one gas engineer software platform.

Start your 14-day free trial and discover a more efficient way to manage your gas engineering business.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://help.tradeapps.co.uk/en/article/privacy-policy-1rwkmw5

## Key features

- Generate industry-standard gas certificates
- Create invoices and estimates
- Offline certificate creation and saving
- Integrated job scheduling and reminders
- Secure cloud storage and data encryption
- Branded documentation with company logo

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly subscription | $199.99 | per year |
| Monthly Subscription | $19.00 | per month |


## Is Gas Certificate App UK safe?

Not enough ratings yet to assess Gas Certificate App UK.

## Is Gas Certificate App UK legit?

Gas Certificate App UK: CP12 appears to be a legitimate app. The AppsHunter Legitimacy Score for Gas Certificate App UK is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (10 of 56)

All indexed reviews: https://appshunter.io/ios/app/gas-certificate-app-uk-cp12/id1293890970/reviews.md

### 5/5 — Brilliant App!

*2026-06-24, version 4.9.2*

I’ve been using gas certificate app now for 3 years since starting my own business and it’s been brilliant.  

 Everything is all user friendly and easy to work round when doing all the gas certificates. It saves all the information what I need for every customer and not having to hold a load of paper copies on the van is very handy when it’s all stored on the app. My customers like that they get a yearly service reminder and emailed certificate on completion of every job. 

The customer service is very helpful when wanting to find out any information on the app from the team. Definitely recommend gas certificate app to any engineer in the industry!

### 5/5 — GREAT APP

*2026-01-21, version 4.8.0*

I know couldnt be without this app, customer support is great aswell

### 5/5 — Mr Thompson - Plumber SE1

*2025-12-24, version 4.8.0*

Good app, great set up

### 1/5 — Trial

*2025-11-30, version 4.7.7*

Everyone raves about this app. Downloaded to try it. Nope. Can’t do anything without an error message. Add customer details? Error. Add certificate? Error. Subscribe? Error. Useless. Giving up trying.

### 5/5 — Great App

*2025-11-19, version 4.7.7*

I work as an admin for our gas company, the engineers find the app really helpful and, for me as the admin, it makes my job so much easier, especially when organising appointments. Getting the reminders to my email really helps me! Great app.

### 5/5 — Definitely recommend

*2025-11-19, version 4.7.7*

As an engineer coming from paper the app is saving me so much time and when I have had needed some guidance the customer service advisor really helped me. Definitely recommend

### 1/5 — NOT RELIABLE

*2025-11-17, version 4.7.6*

This app could be decent but theres to many issues to trust it on jobs. Certs sometimes just duplicate and syncing takes ages or just fails it would be quicker using paper certs then going back an forth as it take ages for anything to get fixed. Maybe it’ll get better but right now I can’t rely on it for my business.

### 2/5 — Full of bugs and errors messages.

*2025-11-14, version 4.7.6*

I thought I would try out this software as I currently use a well known Gas Engineer software. Unfortunately even after the app update to fix the bugs it’s still showing error messages etc. Possibly could be a good piece of software but not at present when trying to run a business.

### 1/5 — Needs improvement

*2025-10-29, version 4.7.5*

It does what it says on the tin but needs lots of improvement. Needs an asset save so you don’t have put in appliance details every time a new cert is made. Needs to save all info of an address with landlord details and any information of the appliances for that address. This very time consuming having to enter appliance details every time.

### 4/5 — “Trail expired” 100s notifications

*2025-10-28, version 4.7.5*

Wanted to try out the app to see if it would offer something my current CRM doesn’t. Sadly after setting up I got no word of a lie a notification every minute until I deleted the app saying “trail expired? Send us a message” 

Sure send one or two but one every single minute is excessive. Also the spelling mistake was enough to be off putting in the first instance but to then get all these notifications just really didn’t fill me with confidence moving forward. Maybe just a bug but left a bit of a sour taste. 

Will maybe check in later down the line as I can see the potential benefits.

## Frequently asked questions about Gas Certificate App UK

### What does the Gas Certificate App do?

The Gas Certificate App is designed for Gas Safe registered engineers to create, store, and send digital gas certificates, invoices, and job records. It helps streamline administrative tasks, allowing engineers to go paperless and manage their workflow efficiently.

### What types of certificates can I generate?

The app offers over 25 industry-standard digital certificates covering domestic, non-domestic, oil, and miscellaneous sectors. This includes popular certificates like the Landlord Gas Safety Record (CP12), Non-Domestic Gas Safety Record, Legionella Risk Assessment, and various service and breakdown reports.

### How much does the Gas Certificate App cost?

The app is free to download and use, but it offers in-app purchases. This typically means there are premium features or a subscription model for full access to all functionalities and unlimited usage.

### Can I use the app without an internet connection?

Yes, a key feature of the app is its offline functionality. You can complete and save certificates even when you don't have an internet signal. Your data will automatically sync to the cloud once you are back online.

### Who is the target audience for this app?

This app is specifically designed for Gas Safe registered engineers in the UK. It aims to help them manage their jobs, create essential documentation, and improve their overall business operations by digitizing their processes.

## Version history (last 5 releases)

### 4.10.3 — 2026-10-19

We’ve squashed some pesky bugs, fine-tuned the mechanics

### 4.10.2 — 2026-10-06

We’ve squashed some pesky bugs, fine-tuned the mechanics

### 4.10.1 — 2026-09-21

We’ve squashed some pesky bugs, fine-tuned the mechanics

### 4.10.0 — 2026-09-14

We’ve squashed some pesky bugs, fine-tuned the mechanics

### 4.9.9 — 2026-09-04

We’ve squashed some pesky bugs, fine-tuned the mechanics

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| [NovoCheck](https://appshunter.io/ios/app/novocheck/id1215614772) | — | Free | Utilities |
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## More apps by Trade Apps LTD

- [Electrical Certificate App](https://appshunter.io/ios/app/electrical-certificate-app/id1531731405)
- [Plumbing Solder Shop](https://appshunter.io/ios/app/plumbing-solder-shop/id6451108752)

All apps by Trade Apps LTD: https://appshunter.io/developer/1293890969

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-19.*